| AQP | aquaporin |
| OAP | orthogonal array of particles |
| CNS | central nervous system |
| CPE | choroid plexus epithelium |
| CSF | cerebrospinal fluid |
| MS | multiple sclerosis |
| AD | Alzheimer disease |
| PD | Parkinson disease |
| CJD | Creutzfeldt–Jakob disease |
| CAA | cerebral amyloid angiopathy |
| PKA | protein kinase A |
| PKC | protein kinase C |